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Table 3 Multi-level multiple regression analysis of determinants of birth weight (as a continuous outcome) (n = 327877)

From: Are there differences in birth weight between neighbourhoods in a Nordic welfare state?

 

Model 1

Model 2

Model 3

Model 4

Model 5

Model 6

Intercept

3562.58

3563.328

3624.578 (10.368)

3511.860 (8.732)

3518.116 (8.786)

3519.353 (8.713)

 

(2.373)

(2.384)

    

Year of birth

 

3.653 (0.363)

3.943 (0.365)

4.076 (0.335)

3.928 (0.336)

1.867 (0.337)

Fixed effects

Beta (SE)

Neighbourhood economic status

      

   Very high level of resources

  

-

-

-

-

   High level of resources

  

-27.806 (10.938)

-7.206 (9.202)

-5.380 (9.064)

-4.193 (9.180)

   Medium to high level of resources

  

-36.764 (10.850) *

-0.982 (9.024)

2.372 (8.890)

6.625 (9.002)

   Medium level of resources

  

-48.418 (10.776) *

-2.295 (8.961)

2.573 (8.837)

10.105 (8.942)

   Medium to low level of resources

  

-66.231 (10.845) *

-8.818 (9.025)

-2.862 (8.908)

8.061 (9.006)

   Low level of resources

  

-91.652 (11.000) *

-23.591 (9.148)

-14.204 (9.049)

-1.210 (9.135)

   Very low level of resources

  

-138.568 (11.412) *

-56.813 (9.494)*

-44.187 (9.425)*

-33.053 (9.481)*

   Poor

  

-171.387 (12.845) *

-75.971 (10.590)*

-62.003 (10.593) *

-56.028 (10.587) *

Maternal height

   

16.068 (0.143) *

15.908 (0.145) *

16.145 (0.144) *

Length of gestation

      

   22–28 weeks

   

-2580.491 (21.378) *

-2581.771 (21.616) *

-2566.803 (21.657) *

   29–32 weeks

   

-1813.587 (12.011) *

-1815.726 (12.137) *

-1796117 (12.190) *

   33–36 weeks

   

-858.069 (4.653) *

-859.875 (4.697) *

-851.399 (4.692) *

   37–41 weeks (reference)

   

-

-

-

   ≥ 42 weeks

   

293.570 (8.623) *

294.794 (8.729) *

296.171 (8.700) *

Parity

   

147.626 (1.801) *

149.529 (1.818) *

150.013 (1.812) *

Maternal education

      

   Elementary (reference)

    

-43.699 (3.246) *

 

   Secondary (2 yrs)

    

-10.525 (2.448) *

 

   Secondary (3–4 yrs)

    

-

 

   University

    

-6.009 (2.929)

 

Maternal smoking habits (cig/day)

      

   0 (reference)

     

-

   1–9

     

-131.976 (3.041) *

   ≥ 10

     

-199.493 (3.970) *

Random effects

Variance components

Intercept variance; individuals

300378.500

300183.600

300270.600

223262.800

223139.700

219758.000

(SE)

(744.144)

(744.159)

(744.340)

(587.044)

(592.469)

(586.149)

Intercept variance;neighbourhood

2498.777

2427.644

827.088

361.735

324.721

347.552

(SE)

(189.361)

(191.355)

(84.832)

(49.094)

(46.965)

(48.430)

Slope variance; year of birth

NA

11.007

9.691

8.478

7.598

8.049

(SE)

 

(3.970)

(3.893)

(3.282)

(3.263)

(3.289)

Covariance

NA

96.479

16.604

4.691 (9.026)

4.203 (8.796)

7.802 (8.986)

(SE)

 

(20.631)

(13.071)

   

ICC

0.83%

     

Reduction of neighbourhood intercept variance

  

66.9%

85.5%

87.0%

86.1%

  1. NA = not applicable, ICC = intra-class correlation; SE = standard error, * = WALD-statistics > 3